why do they say the rabbit died

The rabbit test, or "Friedman test", was an early at the University of Pennsylvania as an improvement on the 1927 test developed by and. The original test used mice and was based upon the observation that when from a woman in the early months of is injected into immature female, the of the mice enlarge and show. The test was considered reliable, with an error rate of less than 2%. The rabbit test consisted of injecting the tested woman's into a female, and a few days later examining the rabbit's, which would change in response to a secreted only by pregnant women. The hormone, (hCG), is produced during pregnancy and indicates the presence of a fertilized egg; it can be found in a pregnant woman's urine and blood.

The rabbit test became a widely used (animal-based test) to test for pregnancy. The term "rabbit test" was first recorded in 1949 and became a common phrase in the English language. [ Modern pregnancy tests still operate on the basis of testing for the presence of the hormone hCG. Due to medical advances, use of a live animal is no longer required. It is a common misconception that the injected rabbit would die only if the woman was pregnant. This led to the phrase "the rabbit died" being used as a euphemism for a positive pregnancy test.

In fact, all rabbits used for the test died, because they had to be surgically opened in order to examine the ovaries. While it was possible to do this without killing the rabbit, it was generally deemed not worth the trouble and expense. [ A for the rabbit test involved using frogs, specifically the, which, like all frogs, lays eggs instead of getting pregnant, and therefore can yield results without the need to cut the animal open. [ Mattaboy! My wife and I found out recently that she is pregnant, which brought to mind that old phrase, "The rabbit done died. " This got me thinking about that wacky scientific/medical practice of using rabbits as a pregnancy test, and now I need some answers.

What exactly did they do to the rabbit? Who came up with this? When? How? Why rabbits? Help me out, Matt. -- P, the net He done died, eh. Well, I done found out what killed him. Her, actually. Wacky or not, the rabbit test was the first reliable medical pregnancy test, aside from waiting nine months. It was developed by a researcher in physiology at the University of Pennsylvania in the 1930s. Urine from a woman who suspected she was pregnant was injected into a female rabbit.

Pregnant-lady urine contains a lot of chorionic gonadotrophin. If the woman was pregnant, the hormone jolt would cause the rabbit's ovaries to enlarge and develop characteristic surface changes. Unfortunately, the only way to read the test results was to open up bunny and look around. So it wasn't so much that the rabbit done died; more like the rabbit was done in. Hold on a moment while I envision a shelf full of 1950s-era home pregnancy tests. Lots of wiggling noses and a big knife. в July 30, 2014 в March 20, 2013 в Feb. 18, 2009 в May 8, 2003 в July 13, 1989